Question

2x ao quadrado -8x+8=0? valendo 20 pontos

Answer 1

2x²-8x+8=0
x²-4x+4=0

Bhaskara
∆=16-4(1)(4)
∆=16-16
∆=0

x=4/2
x=2

Answer 2

2x²-8x+8=0 Utilize Bhaskara
A = 2 B = -8 C = 8
Δ = b² - 4.a.c 
Δ = -8² - 4 . 2 . 8 
Δ = 64 - 64
Δ = 0
Neste caso, x' = x'':
x = (-b +- √Δ)/2.a
x' = (--8 + √0)/2.2   
x' = 8 / 4  
x' = 2  
x'' = (--8 - √0)/2.2
x'' = 8 / 4
x'' = 2